Hi, thank you for the suggestions, but I have many other web services - published on another server and generated in another way - that are correctly called using the webserviceid.operation.send(param1, param2, ..., paramN) syntax.
Anyway, I tried the alternative calling method (the Object 'bag' for parameters), obtaining the same result. It is almost sure that the problem is not the call itself, but the WSDL parsing that must be performed first. I've stepped into the code in debug mode, a little bit more detail is printed in the Flex Builder log window, so this should be the exact line of code where the error occurs: C:\dev\enterprise_bali\frameworks\mx\rpc\soap\WSDLParser.as:626 Unfortunately, the source for the mx.rpc package isn't available in the SDK. Cosma
